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Nebula progress

SETI@Home - Št, 21.01.2021 - 07:59
Read about recent progress in our back-end data analysis: Taking the long view
Kategórie: Novinky z projektov

SETI@home talk today

SETI@Home - St, 13.01.2021 - 23:07
David Anderson will give a talk on SETI@home for the Zoom meeting of the Steel City ARC, today at 7:30 PM Eastern time. UPDATE: a recording of the talk is here.
Kategórie: Novinky z projektov

Good Riddance 2020! Challenge starts January 14th

PrimeGrid - Po, 11.01.2021 - 19:08
The first challenge of the 2021 Series will be a 5-day challenge celebrating the end of the abomination which was the year 2020. The challenge will be offered on the PPS-DIV (LLR) application, beginning 14 January 00:00 UTC and ending 18 January 23:59 UTC. To participate in the Challenge, please select only the Fermat Divisor Search LLR (PPS-DIV) project in your PrimeGrid preferences section. Comments? Concerns? Discuss on the forum post for this challenge. Best of luck!
Kategórie: Novinky z projektov

Another DIV Mega Prime!

PrimeGrid - Ne, 10.01.2021 - 17:33
On 13 December 2020, 16:07:34 UTC, PrimeGrid's Fermat Divisor Search found the Mega Prime: 45*2^7661004+1 The prime is 2,306,194 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 77th overall. The discovery was made by Tim Terry (TimT) of the United States using an Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz with 32GB RAM, running Linux Fedora. This computer took about 1 hour, 10 minutes to complete the primality test using LLR2. Tim Terry is a member of the Aggie The Pew team. For more details, please see the official announcement.
Kategórie: Novinky z projektov

DIV Mega Prime!

PrimeGrid - Ne, 10.01.2021 - 17:28
On 6 December 2020, 02:07:48 UTC, PrimeGrid's Fermat Divisor Search found the Mega Prime: 15*2^7619838+1 The prime is 2,293,801 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 78th overall. The discovery was made by an anonymous user of China using an Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz with 16GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 2 hours to complete the primality test using LLR2. For more details, please see the official announcement.
Kategórie: Novinky z projektov

New Separation Runs 1/6/2021

Milkyway@Home - St, 06.01.2021 - 21:15
Hello Everyone,

I have put up the following separation runs:

de_modfit_80_bundle4_4s_south4s_bgset_4
de_modfit_81_bundle4_4s_south4s_bgset_4
de_modfit_82_bundle4_4s_south4s_bgset_4
de_modfit_83_bundle4_4s_south4s_bgset_4
de_modfit_84_bundle4_4s_south4s_bgset_4
de_modfit_85_bundle4_4s_south4s_bgset_4
de_modfit_86_bundle4_4s_south4s_bgset_4

And I have taken down the following separation runs:

de_modfit_80_bundle4_4s_south4s_bgset_3
de_modfit_81_bundle4_4s_south4s_bgset_3
de_modfit_82_bundle4_4s_south4s_bgset_3
de_modfit_83_bundle4_4s_south4s_bgset_3
de_modfit_84_bundle4_4s_south4s_bgset_3
de_modfit_86_bundle4_4s_south4s_bgset_3

The new runs are copies of the previous bgset_3 runs and bgset_2 runs, in order to get yet another set of data to compare against. In the last set of runs, Stripe 84 didn't seem to cause problems like it did in the bgset_2 runs, but Stripe 85 did. As before, I will keep a close eye on these forums for a few weeks in order to see whether you are having any trouble with some of the Stripes.

You may continue to see workunits from bgset_2 runs for the next few days as workunits finish up and complete validation. This is expected and normal. You may start seeing the new runs as soon as your machine downloads new workunits from the server.

Thank you all for your continued support with this project. I hope you are staying safe in the pandemic world that we're stuck in for a little while longer.

Best,
Tom
Kategórie: Novinky z projektov

New Milkyway Badges Online

Milkyway@Home - Ut, 05.01.2021 - 20:21
Hello Everyone,

I have updated the badges that we have for this project, including badges up to 20 years and 100 billion credits. You can find the new list of badges below:



Thank you to everyone who has put time into this project. An especially big thank you to people that we had to make badges for -- I've already seen an 11 year and a 13 year badge. We also have a couple users who are approaching the previous limit of the 10B credit badge.

- Tom
Kategórie: Novinky z projektov

Thanks for supporting SixTrack at LHC@Home and updates

LHC@home - Ut, 23.01.2018 - 19:08
Dear volunteers,

All members of the SixTrack team would like to thank each of you for supporting our project at LHC@Home. The last weeks saw a significant increase in work load, and your constant help did not pause even during the Christmas holidays, which is something that we really appreciate!

As you know, we are interested in simulating the dynamics of the beam in ultra-relativistic storage rings, like the LHC. As in other fields of physics, the dynamics is complex, and it can be decomposed into a linear and a non-linear part. The former allows the expected performance of the machine to be at reach, whereas the latter might dramatically affect the stability of the circulating beam. While the former can be analysed with the computing power of a laptop, the latter requires BOINC, and hence you! In fact, we perform very large scans of parameter spaces to see how non-linearities affect the motion of beam particles in different regions of the beam phase space and for different values of key machine parameters. Our main observable is the dynamic aperture (DA), i.e. the boundary between stable, i.e. bounded, and unstable, i.e., unbounded, motion of particles.

The studies mainly target the LHC and its upgrade in luminosity, the so-called HL-LHC. Thanks to this new accelerator, by ~2035, the LHC will be able to deliver to experiments x10 more data than what is foreseen in the first 10/15y of operation of LHC in a comparable time. We are in full swing in designing the upgraded machine, and the present operation of the LHC is a unique occasion to benchmark our models and simulation results. The deep knowledge of the DA of the LHC is essential to properly tune the working point of the HL-LHC.

If you have crunched simulations named "workspace1_hl13_collision_scan_*" (Frederik), then you have helped us in mapping the effects of unavoidable magnetic errors expected from the new hardware of the HL-LHC on dynamic aperture, and identify the best working point of the machine and correction strategies. Tasks named like "w2_hllhc10_sqz700_Qinj_chr20_w2*" (Yuri) focus the attention onto the magnets responsible for squeezing the beams before colliding them; due to their prominent role, these magnets, very few in number, have such a big impact on the non-linear dynamics that the knobs controlling the linear part of the machine can offer relevant remedial strategies.

Many recent tasks are aimed at relating the beam lifetime to the dynamic aperture. The beam lifetime is a measured quantity that tells us how long the beams are going to stay in the machine, based on the current rate of losses. A theoretical model relating beam lifetime and dynamic aperture was developed; a large simulation campaign has started, to benchmark the model against plenty of measurements taken with the LHC in the past three years. One set of studies, named "w16_ats2017_b2_qp_0_ats2017_b2_QP_0_IOCT_0" (Pascal), considers as main source of non-linearities the unavoidable multipolar errors of the magnets, whereas tasks named as "LHC_2015*" (Javier) take into account the parasitic encounters nearby the collision points, i.e. the so called "long-range beam-beam effects".

One of our users (Ewen) is carrying out two studies thanks to your help. In 2017 DA was directly measured for the first time in the LHC at top energy, and nonlinear magnets on either side of ATLAS and CMS experiments were used to vary the DA. He wants to see how well the simulated DA compares to these measurements. The second study seeks to look systematically at how the time dependence of DA in simulation depends on the strength of linear transverse coupling, and the way it is generated in the machine. In fact, some previous simulations and measurements at injection energy have indicated that linear coupling between the horizontal and vertical planes can have a large impact on how the dynamic aperture evolves over time.

In all this, your help is fundamental, since you let us carry out the simulations and studies we are interested in, running the tasks we submit to BOINC. Hence, the warmest "thank you" to you all!
Happy crunching to everyone, and stay tuned!

Alessio and Massimo, for the LHC SixTrack team.
Kategórie: Novinky z projektov

LHC@home down-time due to system updates

LHC@home - Ut, 23.01.2018 - 11:19
Tomorrow Wednesday 24/1, the LHC@home servers will be unavailable for a short period while our storage backend is taken down for a system update.

Today, Tuesday 23/1, some of the Condor servers that handle CMS, LHCb and Theory tasks will be down for a while. Regarding the on-going issues with upload of files, please refer to this thread.

Thanks for your understanding and happy crunching!
Kategórie: Novinky z projektov

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